Plant doctor
Now, love to plant flowers and grass more and more citizens and friends, but family flowers also have a lot of skills, in order to let you no longer worry about family flowers, Fengxian District Green city appearance bureau with the help of community horticulturists to open the online "plant doctor" column, 12 landscaping experts for you to answer the confusion in plant conservation.
Citizen question: How come my rosemary is half withered?
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Plant Doctor:
Judging from the photos you sent, half of the open-ground cultivation of rosemary has withered, if it is in the summer, it is likely that this situation is due to the soil is not breathable, resulting in rotten roots, it is recommended to raise the planting bed a little, which can effectively avoid the occurrence of water accumulation in the rainy season, greatly reducing the probability of rosemary having problems in the root system. At the same time, summer rosemary outdoors should also pay attention to whether it is endangered by perilla borer, please carefully observe the leaves of this rosemary to see if the leaf cluster has a phenomenon of entanglement, if so, then it proves that the plant may be infested. This pest is slender, mimics the leaves of rosemary, young larvae in the leaf back of the silk feeding hazard, leaving only the leaf epidermis, with the growth of insect age can be seen in the morning and evening about 2 cm length of larva to eat the leaves, resulting in rosemary part of the branches gradually withered, the insect in Shanghai mainly eat rosemary and perilla, 1 year can occur 3 generations, can be manually cut off the larval branches to effectively remove insect pests.
Citizen question: What is the problem with the poor growth of this orange tree?
Judging from the photos you sent, the orange tree leaves in the photo are fewer, the tree is weak, and the leaves may be caused by one or more of the following four reasons: one is caused by too much watering, and it is necessary to water according to the principle of seeing dry and wet; the second is improper fertilization, fertilizer damage, it will also burn the root system, and the phenomenon of leaf fall can be diluted by irrigating with a large amount of water; third, if it is infected with red spider insect infestation in the summer, there will be leaf drops, and it is best to prune the diseased leaves at this time. After that, insecticides such as avermectin can be sprayed for treatment, and reasonable maintenance in the later stage can avoid the phenomenon of leaf fall; fourth, the winter temperature is too low, there will be leaf loss, and antifreeze can be prevented by pouring antifreeze water, laying mulch film or straw, and brushing the trunk white.
Citizen question: What is wrong with this peony flower? How should I fix it?
Judging from the photos you sent, the two pots of peonies are not growing well, but they are not a big problem. To raise peonies in Shanghai, we should pay attention to the following three points: First, carry out plastic pruning 3 times a year, the first pruning should be carried out in early March, mainly drying, budding and budding; in mid-to-late April to early May, when the peony flowers begin to wither and lose their ornamental value, the second pruning is carried out, and the residual flowers (together with the peduncle) are cut in time to reduce nutrient consumption; the third pruning is carried out in October to November after the fall of leaves (plants that fall early can be pruned in advance), and dead branches and dead leaves are pruned. Second, in terms of fertilizer water management, peonies should be dry and avoid wet, watering should be controlled, there can be no waterlogging, the growth season should be watered frequently, the amount of water required during the flowering period is also more, to increase the number of times, but also to spray water frequently, if in the winter dormancy stage, it is necessary to control water. Peony likes fertilizer, sufficient nutrients are conducive to cultivating large flowers and colorful peonies, such as long-term lack of nutrient supplementation, will be due to insufficient nutrition and weakened growth, prone to disease. In general, peony cultivation is applied three times a year, before flowering fertilizer is applied in early March, after flowering is applied from late April to May, and basal fertilizer is applied in mid-to-late November. The third is to pay attention to the prevention and control of diseases and insect pests, Shanghai's pests of peony are mainly peony gray mold disease, brown spot disease, anthrax, stem rot and root rot, etc., once the disease is found, you can spray 1% lime equivalent Bordeaux liquid, 65% daisen zinc 500 ~ 600 times liquid to control, timely removal of disease residues and incineration or deep burial. Peony often occurs in the autumn insect pests, its main insect pests are grubs, inchworms, roll moths and so on. When pests harm peonies, it is easy to bite their new branches and flower buds, so they should be killed or sprayed in time to kill the enemy insects. At the same time, strengthening cultivation management, enhancing ventilation and light transmission, and applying more organic fertilizers also have a positive effect on preventing the occurrence of diseases and insect pests. In addition, after heavy rain and after the warm spring, the soil should be loosened in time to promote the healthy growth of peonies.
Thank you to the above friends for participating in the online "Plant Doctor" column consultation.
Dear citizens, you can send plant photos directly on the official WeChat of "Fengxian Green Cityscape" and leave a message related to the question, we will reply to it every Monday.
Written by: Zhang Chaoqun (Fengxian Green Cityscape)
Editor: Dai Junwen